Fan base



FIG. 1 is a front, right, top perspective view of the fan base;

FIG. 2 is a front elevation view of the fan base of FIG. 1;

FIG. 3 is a rear elevation view of the fan base of FIG. 1;

FIG. 4 is a top elevation view of the fan base of FIG. 1;

FIG. 5 is a bottom elevation view of the fan base of FIG. 1;

FIG. 6 is a left side elevation view of the fan base of FIG. 1;

FIG. 7 is a right side elevation view of the fan base of FIG. 1; and,

FIG. 8 is a rear, left, top perspective view of the fan base of FIG. 1. 

CLAIM The ornamental design for a fan base, as shown and described. 